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From: Ed Maste <emaste@freebsd.org>
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Cc: src-committers@freebsd.org, delphij@gmail.com, svn-src-all@freebsd.org,
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	"M. Warner Losh" <imp@bsdimp.com>
Subject: Re: svn commit: r204309 - in head/sys: amd64/amd64 amd64/isa conf
	i386/bios i386/cpufreq i386/i386 i386/isa i386/xen isa
	modules/bios/smbios modules/bios/vpd modules/cpufreq
	pc98/pc98 x86 x86/bios x86/...
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[ About the i386/amd64/pc98 -> x86 merge ]

> > : I think there have been already MFCed patches doing headers movements
> > : in the past.
> > 
> > We've tried to keep the KPI upwardly compatible.  If files move, then
> > old code will potentially break.
> 
> Yes, but there is very non-trivial cost of not merging this.
> It makes testing in HEAD of other patches less valuable for merges,
> and merges itself becomes more time-consuming and risking.
> 
> Fortunately, I do not no dri, but I know that maintaining patches
> both for 7 and 8/HEAD of dri is a hell.

For headers on older branches we can just leave backwards compatibility
stubs in the i386, amd64 and pc98 directories that include the header
from the new x86 directory.

-Ed